From b81309bb312ce02a437bc9b12ab80e6071afa3cf Mon Sep 17 00:00:00 2001
From: Christopher Vogt <oss.nsp@cvogt.org>
Date: Mon, 13 Feb 2017 08:55:41 -0500
Subject: fix deadlock in class loading cache

---
 nailgun_launcher/CbtURLClassLoader.java | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/nailgun_launcher/CbtURLClassLoader.java b/nailgun_launcher/CbtURLClassLoader.java
index bf698b0..10add77 100644
--- a/nailgun_launcher/CbtURLClassLoader.java
+++ b/nailgun_launcher/CbtURLClassLoader.java
@@ -15,7 +15,7 @@ public class CbtURLClassLoader extends java.net.URLClassLoader{
       + "\n)"
     );
   }
-  ConcurrentHashMap<String,Class> cache = new ConcurrentHashMap<String,Class>();
+  ConcurrentHashMap<Object,Object> cache = new ConcurrentHashMap<Object,Object>();
   public Class loadClass(String name) throws ClassNotFoundException{
     Class _class = super.loadClass(name);
     if(_class == null) throw new ClassNotFoundException(name);
@@ -25,12 +25,18 @@ public class CbtURLClassLoader extends java.net.URLClassLoader{
     //System.out.println("loadClass("+name+") on \n"+this);
     synchronized( cache ){
       if(!cache.containsKey(name))
+        cache.put(name, new Object());
+    }
+    Object key = cache.get(name);
+    synchronized( key ){
+      if(!cache.containsKey(key)){
         try{
-          cache.put(name, super.loadClass(name, resolve));
+          cache.put(key, super.loadClass(name, resolve));
         } catch (ClassNotFoundException e){
-          cache.put(name, Object.class);
+          cache.put(key, Object.class);
         }
-      Class _class = cache.get(name);
+      }
+      Class _class = (Class) cache.get(key);
       if(_class == Object.class){
         if( name.equals("java.lang.Object") )
           return Object.class;
-- 
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